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This research aims to develop English Language Teaching (ELT) materials based on the Mastery Learning Model specifically for chapter 3 "Home Sweet Home" in unit 3 "Let's Clean Up" at MTsN Gowa, based on the Kurikulum Merdeka and supported by the Mastery Learning model. The researcher employed the Research and Development (R&D) method using the ADDIE model as the instructional design framework. In the analysis phase, the researcher identified the target and learning needs of the students by distributing questionnaires to analyze the needs of seventh-grade students at MTsN Gowa. During the design phase, the researcher created the Alur Tujuan Pembelajaran (ATP), which included learning indicators from the mastery learning model. The development of ELT materials followed the stages of mastery learning: orientation, presentation, structured training, guided practice, and self-practice. Results from the need analysis indicated that students were generally able to describe and categorize waste but struggled with using imperative sentences. The designed materials effectively addressed these gaps, enhancing students' understanding and ability to use imperative sentences.  The development phase saw the creation of these tailored ELT materials, which were then tested and refined through iterative feedback and revisions. Validation results indicated a high level of validity with a score of 3.8, classifying the materials as very valid. In conclusion, the study demonstrated that incorporating Mastery Learning principles into ELT materials significantly improves learning outcomes by addressing specific student needs and preferences. The systematic approach of need analysis, design, development, and evaluation ensures that the materials are not only educationally effective but also engaging and enjoyable for students. Future researchers can build on this work by conducting the implementation phase, which was skipped in this study, to further validate and refine the effectiveness of these materials in broader educational contexts.

RnD, ELT Material, Mastery Learning